01 - In a small bowl, combine minced garlic, chopped rosemary, thyme leaves, Dijon mustard, olive oil, kosher salt, and black pepper. Mix thoroughly to form a cohesive paste.
02 - Pat the rack of lamb completely dry with paper towels. Rub the marinade paste evenly over all surfaces of the lamb, ensuring full coverage.
03 - Place the seasoned lamb in a shallow dish or resealable bag. Refrigerate for at least 1 hour, or overnight for maximum flavor penetration.
04 - Remove lamb from refrigerator 30 minutes before cooking. Preheat oven to 425°F.
05 - Heat 1 tablespoon olive oil in an ovenproof skillet over medium-high heat. Sear lamb for 2–3 minutes per side until a golden-brown crust forms.
06 - Transfer skillet to preheated oven. Roast 15–20 minutes for medium-rare (125–130°F internal temperature), 20–25 minutes for medium, or 25–30 minutes for well-done.
07 - Remove from oven and tent loosely with aluminum foil. Let rest for 10 minutes to allow juices to redistribute throughout the meat.
08 - Slice between bones into individual chops. Sprinkle with flaky sea salt immediately before serving.